Response of Diospyros kaki plants to different deficit irrigation treatments

Isabel Griñán Mora


BACKGROUND: The purpose of the present study was to analyze leaf water relations in persimmon trees (Diospyros kaki L.f.) in order to clarify the avoidance and tolerance mechanisms developed in response to a water stress and during recovery.

RESULTS: The results indicated that the persimmon plants from which irrigation was withheld experienced a mild water stress and developed slowly. From the beginning of water stress, the leaf conductance (gl) of stressed plants decreased, preventing the loss of leaf turgor. In addition, the gradual recovery of gl after the resumption of irrigation can be considered as a mechanism to promote the rehydration of the leaves.

CONCLUSION: Persimmon plants faced with situations of mild water deficit develop a stress avoidance mechanism, rather than a stress tolerance. This water deficit avoidance mechanism was based not only on a decrease in the circadian values of leaf conductance but on a reduction in the duration of maximum stomatal opening as the water deficit progressed. The efficiency of this mechanism was fully supported by the maintenance cell turgor in all the circumstances studied.


ISSN: 2530-7320

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